diff --git a/nova/api/openstack/v2/__init__.py b/nova/api/openstack/v2/__init__.py
index 1ea2ba250a9..5575cd1842d 100644
--- a/nova/api/openstack/v2/__init__.py
+++ b/nova/api/openstack/v2/__init__.py
@@ -26,6 +26,7 @@
 
 from nova.api.openstack.v2 import accounts
 from nova.api.openstack.v2 import consoles
+from nova.api.openstack.v2 import extensions
 from nova.api.openstack.v2 import flavors
 from nova.api.openstack.v2 import images
 from nova.api.openstack.v2 import image_metadata
@@ -101,11 +102,36 @@ def factory(cls, global_config, **local_config):
         return cls()
 
     def __init__(self, ext_mgr=None):
+        if ext_mgr is None:
+            ext_mgr = extensions.ExtensionManager()
+
         self.server_members = {}
         mapper = ProjectMapper()
         self._setup_routes(mapper)
+        self._setup_ext_routes(mapper, ext_mgr)
         super(APIRouter, self).__init__(mapper)
 
+    def _setup_ext_routes(self, mapper, ext_mgr):
+        serializer = wsgi.ResponseSerializer(
+            {'application/xml': wsgi.XMLDictSerializer()})
+        for resource in ext_mgr.get_resources():
+            LOG.debug(_('Extended resource: %s'),
+                      resource.collection)
+            if resource.serializer is None:
+                resource.serializer = serializer
+
+            kargs = dict(
+                controller=wsgi.Resource(
+                    resource.controller, resource.deserializer,
+                    resource.serializer),
+                collection=resource.collection_actions,
+                member=resource.member_actions)
+
+            if resource.parent:
+                kargs['parent_resource'] = resource.parent
+
+            mapper.resource(resource.collection, resource.collection, **kargs)
+
     def _setup_routes(self, mapper):
         server_members = self.server_members
         server_members['action'] = 'POST'
diff --git a/nova/api/openstack/v2/extensions.py b/nova/api/openstack/v2/extensions.py
index 91db251f561..b3fbfc923b0 100644
--- a/nova/api/openstack/v2/extensions.py
+++ b/nova/api/openstack/v2/extensions.py
@@ -293,27 +293,6 @@ def __init__(self, application, ext_mgr=None):
 
         mapper = nova.api.openstack.v2.ProjectMapper()
 
-        serializer = wsgi.ResponseSerializer(
-            {'application/xml': wsgi.XMLDictSerializer()})
-        # extended resources
-        for resource in ext_mgr.get_resources():
-            LOG.debug(_('Extended resource: %s'),
-                        resource.collection)
-            if resource.serializer is None:
-                resource.serializer = serializer
-
-            kargs = dict(
-                controller=wsgi.Resource(
-                    resource.controller, resource.deserializer,
-                    resource.serializer),
-                collection=resource.collection_actions,
-                member=resource.member_actions)
-
-            if resource.parent:
-                kargs['parent_resource'] = resource.parent
-
-            mapper.resource(resource.collection, resource.collection, **kargs)
-
         # extended actions
         action_resources = self._action_ext_resources(application, ext_mgr,
                                                         mapper)
@@ -368,11 +347,22 @@ class ExtensionManager(object):
 
     """
 
-    def __init__(self):
-        LOG.audit(_('Initializing extension manager.'))
+    _ext_mgr = None
+
+    @classmethod
+    def reset(cls):
+        cls._ext_mgr = None
+
+    def __new__(cls):
+        if cls._ext_mgr is None:
+            LOG.audit(_('Initializing extension manager.'))
+
+            cls._ext_mgr = super(ExtensionManager, cls).__new__(cls)
+
+            cls._ext_mgr.extensions = {}
+            cls._ext_mgr._load_extensions()
 
-        self.extensions = {}
-        self._load_extensions()
+        return cls._ext_mgr
 
     def register(self, ext):
         # Do nothing if the extension doesn't check out
diff --git a/nova/tests/api/openstack/v2/test_extensions.py b/nova/tests/api/openstack/v2/test_extensions.py
index 91c86bdad1b..650770f5053 100644
--- a/nova/tests/api/openstack/v2/test_extensions.py
+++ b/nova/tests/api/openstack/v2/test_extensions.py
@@ -89,6 +89,7 @@ def setUp(self):
         ext_list.append('nova.tests.api.openstack.v2.extensions.'
                         'foxinsocks.Foxinsocks')
         self.flags(osapi_extension=ext_list)
+        extensions.ExtensionManager.reset()
 
 
 class ExtensionControllerTest(ExtensionTestCase):
@@ -227,7 +228,7 @@ class ResourceExtensionTest(ExtensionTestCase):
 
     def test_no_extension_present(self):
         manager = StubExtensionManager(None)
-        app = v2.APIRouter()
+        app = v2.APIRouter(manager)
         ext_midware = extensions.ExtensionMiddleware(app, manager)
         ser_midware = wsgi.LazySerializationMiddleware(ext_midware)
         request = webob.Request.blank("/blah")
@@ -238,7 +239,7 @@ def test_get_resources(self):
         res_ext = extensions.ResourceExtension('tweedles',
                                                StubController(response_body))
         manager = StubExtensionManager(res_ext)
-        app = v2.APIRouter()
+        app = v2.APIRouter(manager)
         ext_midware = extensions.ExtensionMiddleware(app, manager)
         ser_midware = wsgi.LazySerializationMiddleware(ext_midware)
         request = webob.Request.blank("/123/tweedles")
@@ -250,7 +251,7 @@ def test_get_resources_with_controller(self):
         res_ext = extensions.ResourceExtension('tweedles',
                                                StubController(response_body))
         manager = StubExtensionManager(res_ext)
-        app = v2.APIRouter()
+        app = v2.APIRouter(manager)
         ext_midware = extensions.ExtensionMiddleware(app, manager)
         ser_midware = wsgi.LazySerializationMiddleware(ext_midware)
         request = webob.Request.blank("/123/tweedles")
@@ -262,7 +263,7 @@ def test_bad_request(self):
         res_ext = extensions.ResourceExtension('tweedles',
                                                StubController(response_body))
         manager = StubExtensionManager(res_ext)
-        app = v2.APIRouter()
+        app = v2.APIRouter(manager)
         ext_midware = extensions.ExtensionMiddleware(app, manager)
         ser_midware = wsgi.LazySerializationMiddleware(ext_midware)
         request = webob.Request.blank("/123/tweedles")
@@ -283,7 +284,7 @@ def test_non_exist_resource(self):
         res_ext = extensions.ResourceExtension('tweedles',
                                                StubController(response_body))
         manager = StubExtensionManager(res_ext)
-        app = v2.APIRouter()
+        app = v2.APIRouter(manager)
         ext_midware = extensions.ExtensionMiddleware(app, manager)
         ser_midware = wsgi.LazySerializationMiddleware(ext_midware)
         request = webob.Request.blank("/123/tweedles/1")
diff --git a/nova/tests/integrated/test_extensions.py b/nova/tests/integrated/test_extensions.py
index 4318e30f2da..b10da166a18 100644
--- a/nova/tests/integrated/test_extensions.py
+++ b/nova/tests/integrated/test_extensions.py
@@ -17,6 +17,7 @@
 
 import os
 
+from nova.api.openstack.v2 import extensions
 from nova import flags
 from nova.log import logging
 from nova.tests.integrated import integrated_helpers
@@ -28,6 +29,8 @@
 
 class ExtensionsTest(integrated_helpers._IntegratedTestBase):
     def _get_flags(self):
+        extensions.ExtensionManager.reset()
+
         f = super(ExtensionsTest, self)._get_flags()
         f['osapi_extension'] = FLAGS.osapi_extension[:]
         f['osapi_extension'].append('nova.tests.api.openstack.v2.extensions.'